Expression of sulfated carbohydrates and Muc2 in the intestine of WT, KO, and DKO mice. Frozen sections from WT, KO, and DKO mice were stained with Alcian blue (pH 1.0), or anti-Muc2 pAb. Bar, 50 μm. Data are representative of three (WT and KO), or two (DKO) independent experiments.